// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include "cpp/cpp_generator.h"

#include <vector>
#include <utility>

#include "cpp/cpp_file.h"
#include "cpp/cpp_helpers.h"
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/descriptor.pb.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {

CppGenerator::CppGenerator() {}
CppGenerator::~CppGenerator() {}

bool CppGenerator::Generate(const FileDescriptor* file,
	const string& parameter,
	GeneratorContext* generator_context,
	string* error) const {
		vector<pair<string, string> > options;
		ParseGeneratorParameter(parameter, &options);

		// -----------------------------------------------------------------
		// parse generator options

		// TODO(kenton):  If we ever have more options, we may want to create a
		//   class that encapsulates them which we can pass down to all the
		//   generator classes.  Currently we pass dllexport_decl down to all of
		//   them via the constructors, but we don't want to have to add another
		//   constructor parameter for every option.

		// If the dllexport_decl option is passed to the compiler, we need to write
		// it in front of every symbol that should be exported if this .proto is
		// compiled into a Windows DLL.  E.g., if the user invokes the protocol
		// compiler as:
		//   protoc --cpp_out=dllexport_decl=FOO_EXPORT:outdir foo.proto
		// then we'll define classes like this:
		//   class FOO_EXPORT Foo {
		//     ...
		//   }
		// FOO_EXPORT is a macro which should expand to __declspec(dllexport) or
		// __declspec(dllimport) depending on what is being compiled.
		string dllexport_decl;

		for (int i = 0; i < options.size(); i++) {
			if (options[i].first == "dllexport_decl") {
				dllexport_decl = options[i].second;
			} else {
				*error = "Unknown generator option: " + options[i].first;
				return false;
			}
		}

		// -----------------------------------------------------------------


		string basename = StripProto(file->name());
		basename.append(".pb");  

		FileGenerator file_generator(file, dllexport_decl);

		// Generate header.
		{
			scoped_ptr<io::ZeroCopyOutputStream> output(
				generator_context->Open(basename + ".h"));
			io::Printer printer(output.get(), '$');
			file_generator.GenerateHeader(&printer);
		}

		// Generate cc file.
		{
			scoped_ptr<io::ZeroCopyOutputStream> output(
				generator_context->Open(basename + ".cc"));
			io::Printer printer(output.get(), '$');
			file_generator.GenerateSource(&printer);
		}

		return true;
}

}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google
